Puzzle Palace, published 1982: https://www.amazon.com/Puzzle-Palace-National-Intelligence-O...
This guy made a career out of documenting the inner workings of the NSA and what they get up to. It wasn't common knowledge, but it's been known what they get up to, and proof thereof, for decades.
I think The Puzzle Palace (https://www.amazon.com/Puzzle-Palace-National-Intelligence-O...) made the same argument as far back as 1982
"Another high-priority target for the signal chasers at Karamursel [Turkey] is the Soviet space program. On April 23, 1967, a number of analysts were routinely copying the return of Soyuz I, bringing Soviet cosmonaut Vladimir Komarov back from twenty-six hours in space, when problems suddenly developed on re-entry. Recalled one of the intercept operators:
'They couldn't get the chute that slowed his craft down in re-entry to work. They knew what the problem was for about two hours...and were fighting to correct it. It was all in Russian, of course, but we taped it and listened to it a couple of times afterward. Kosygin called him personally. They had a video-phone conversation. Kosygin was crying. He told him he was a hero and that he had made the greatest achievement in Russian history, that they were proud, and that he'd be remembered. The guy's wife got on too. They talked for a while. He told her how to handle their affairs and what to do with the kids. It was pretty awful. Toward the last few minutes he began falling apart, saying, "I don't want to die, you've got to do something." Then there was just a scream as he died. I guess he was incinerated.'"
[1] http://www.amazon.com/Puzzle-Palace-National-Intelligence-Or...
https://en.wikipedia.org/wiki/The_Puzzle_Palace
https://www.amazon.com/Puzzle-Palace-National-Intelligence-O...
After reading that book and getting a better sense of the scope of intelligence operations over a wider swath of history, these types of requests come from make a whole lot more sense (whether you agree or not, you get a sense of the place they're coming from). Not making an argument in regard to what's right or wrong, but it does provide a tangible dose of reality. Also, given this was written in the 80's and much has come to be known since then, I still think this book holds its own in terms of clarity because it discusses historical topics without the messiness of the internet, social media, etc. Bamford has several more recent books, but I have not read those.